Threading device.



A. WUNDERLICHQ THREADING DEVICE.

APPLICATION FILED NOV. 22. 1913.

1,238,376. PatentedAug. 28,1917.

Fig.2.

Wi t n asses .77! (re ntar UNITED STATES PATENT OFFICE.

ADOLPI-I WUNDERLICH, OF CLEVELAND, OHIO.

THREADING DEVICE.

Application filed November 22, 1913.

To all whom it may concern:

Be it known that I, ADoLrH \VUNDERLIGH, of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Threading Devices; and I do hereby declare the following to be a full, clear, and concise description of the invention, such as will enable others skilled in the art to which it appertains to make and use same.

My invention relates to improvements in threading devices which automatically feed in and feed out by operating a drilling machine spindle or the like.

The object of the present invention is to construct such a device without gear wheels, which object I accomplish by the use of cam grooves and lugs engaging therein, by which rotary motion is transmitted at a reduced speed ratio, on the principle of my invention as described in Patent No. 846,273 of March 5, 1907, entitled driving mechanism.

This invention also consists of a novel method of allowing the mechanism to slip, and thereby preventing the tool from breaking when undue strain is put on it.

In the accompanying illustrations Figure 1 is a cross section of the invention, but in which the spindle, chuck, and rods are shown in full; Fig. 2 is a plan of the eccentric; Fig. 3 is a plan of a flange; Fig. 4 is a plan of the ring forming the slipping arrangement; Fig. 5 is a plan of the ring and the cam engaging lugs; Fig. 6 is a plan of the lower half of the outer housing and cam grooves producing the backward motion and Fig. 7 is a plan of the upper half of the outer housing and cam grooves producing the forward movement.

Similar numbers refer to similar parts throughout the several views.

lVhen used on a drilling machine the taper shank 1 Fig. 1 is arranged to fit its spindle and be driven therewith. This shank 1 has a flange 2 and an extension 3 into which a key way a is cut. The upper half of the outer housing 7, has a hole 10 Fig. 7, into which the spindle 3 is slipped and held by means of the flange 2 and collar 5, which is fastened to the outer housing 7, by the screws 6 and the said housing 7 and said collar 5 are arranged to allow the spindle 1, flange 2,

"and extension 3 to freely revolve.

The eccentric 21, Fig. 2 has a hole 22 and a key 23, and slips over the extension 3, Fig. 1 being free to move up or down but is driven Specification of Letters Patent.

Patented A11 28, 1917.

Serial No. 802,558.

by means of the key 23, engaging the key way 4. on said extension.

The eccentric 21 also freely revolves in the ring 30 having lugs 31 Fig. 5 and this ring 30 and eccentric 21 are inclosed in an inner housing consisting of two flanges l7 and 2 1 Fig. 1 these flanges have holes 18 and to allow the engaging lugs to protrude. The flanges are firmly screwed together by screws 32 but the eccentric 21 and ring are free to revolve between these flanges.

The underside of flange 24 has an extenion forming a spindle 27 having a hole 26, and taper shank 23 to carry a chuck 29 to hold a tap 4:3 or other thread cutting tool.

The hole 26 is made of such a size and depth to allow the extension 3 of spindle 1 to move to and fro therein.

To the underside of the upper half of the outer housing 7, the lower half of the outer housing 12 is mounted and fastened thereto by screws 33 passing through holes 9 and 15 Figs. 6 and 7. The extension 27 of the flange 24 passes through the hole 15 Fig. 6 and is free to revolve and also move back and forth therein.

The outer housings 7 and 12 Fig. 1 have two flanges 11 and 13 between which the slip ring 34 is mounted.

This slip ring 34, Fig. 4 has three fiber blocks 14; inserted, one of which is adjustable by means of a metal. plate &5 fitting into the slotstl, and bearing against the adjusting nut 39, by means of this nut any desired clamping or gripping effect may be had on the outer housing.

This slip ring 34: also has a screwed lug 35 into which a rod 36 is driven and this rod is of sufficient length to reach to the pillar or other stationary part of the drilling machine and prevents the ring 34 from revolving.

The screwed lug 35, has a hole 12 into which the rod 37 is slipped which may be firmly clamped by means of nut 38.

Then this rod 36 comes up to the work operated on, it prevents the further forward movement of the device, the thread cutting tool however continues its forward motion until the lugs 31 are disengaged from the cam grooves 8, the thread cutting tool then no longer continues to revolve or move forward and it is then ready to be reversed.

This forward m'otion is produced as follows: I On the inner face of the outer housing-7, cam grooves 8 are cut, into which the lugs 31 of the ring 30 are pressed when the drill or tap is forced against the work. The eccentric 21 revolves with the driving spindle and carries with it the ring 30. The cam grooves 8 prevent the ring 30 from moving with the eccentric but allow a certain rotation about the axis and a certain rotation about the lugs 31 as axes. As a result the motion of the eccentric is divided and the ring 30 revolves about the spindle at a reduced speed. To change this motion of the ring to circular motion the flange 17 is provided which has the holes 18. These holes are large enough to allow the lugs of the ring to move as the ring turns about one of the same as an axis, the flange being rigidly connected to the driven spindle, can of course revolve only about the spindle as an axis, thus producing true circular motion.

\Vhen the reverse motion is desired as when withdrawing the tool from the work, the lugs 31 are brought into engagement with the cam grooves 14: out in the inner face of the housing 12. These grooves are so arranged, that the ring 30 is revolved in the opposite direction to the eccentric 21 thus driving the driven spindle and the tool so as to withdraw the same from the work.

The grooves here shown are designed to give a ratio of three to one between the driving and driven spindles, but different speed ratios may be produced by changing the form of the cam grooves cut in the faces of the housings.

Bringing the device up to the work to be operated on and pressing it toward same, which is generally accomplished by means of a lever on the drilling machine, causes the lugs to engage in the cam grooves 011 the upper face producing the forward motion, while moving the device away from the work the cam grooves on the lower face are engaged, these producing the reverse motion.

Having now described my invention, what I claim and desire to secure by Letters Pat ent is 1. The combination of housings having cam grooves on their inner faces, a spindle extending into said housings, an eccentric between said housings driven by means of said spindle, a ring having lugs driven by means of said eccentric and a spindle extending out of said housings carrying a tool and having flanges with recesses inclosing said ring and eccentric, and arranged to be driven by means of said eccentric and ring substantially as described.

2. The combination of housings having cam grooves on their inner faces, a spindle extending into said housings, an eccentric between said housings driven by means of said spindle, a ring having lugs or pins driven by means of said eccentric, and a spindle carrying a threading tool and hav ing a flange with recesses inclosing said ring and eccentric and arranged to be driven by means of said eccentric and ring substantially as described.

3. The combination of a face cam of the order producing a forward motion, a face cam of the order producing a reverse motion, a ring or the equivalent having lugs or projections to engage said cams, means to revolve said ring, and a driven element operated'by said ring and adapted to engage either one or the other of said cams, substantially as described.

4. The combination of housings containin driving mechanism, a ring surrounding said housings, brake shoes mounted on the inner surface of said ring, means carried by said ring for tightening said shoes in order to control the rotation of said housings, a threaded lug mounted on said ring and having a projecting end adapted to act as a stop for said ring, said lug having .an aperture, a rod adapted to be inserted in such aperture to act as an adjustable stop, and means for holding said rod in position.

5. In a threading device the combination of housings having cam grooves upon the inner faces; a driving spindle extending into said housings; a driven spindle extending out of said housings; and speed reducing means mounted within said housings and adapted to engage with either of such cam grooves to operatively connect said two spindles.

6. In a threading device the combination of housings having cam grooves upon the inner faces; a driving spindle extending into said housings; a driven spindle extending out of said housings; and speed reducing means mounted within said housings and adapted to engage with either of such cam grooves to operatively connect said spindles, engagement with one of said groves producing a forward motion of said driven spindle, and engagement with the other of such grooves producing a reverse motion.

ADOLPH WUNDERLIOH. WVitnesses:

C. F. Bnnrrwns, A. B. Bnnrrwne.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

